Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
van pham » san pham, van phan, van phat
thanh va » thanh van, thanh ha, thanh ve
thuc van » thuc vat, thuc dan, thuc va
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
tang van » dang van, hoang van, trong van
cau treo » cau theo, cau tren, cau triet
van hoi » van hoa, van hoc, van hoe
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren
y tang » ky tang, 6 tang, 7 tang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y tang van hoi. hieu van pham thuc van ((thanh va) or (hanh va)) ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y tang van hoi. hieu van pham thuc van ((thanh va) OR (hanh va)) ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y tang van hoi. hieu van pham thuc van ((thanh va) or (hanh va)) ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: toc sach y tang van hoi. hieu van pham thuc van ((thanh va) or (hanh va)) ((cuu tre) OR (cau treo))*.