Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
y nang » ky nang, ly nang, v nang
do ve » dao ve, do ke, do va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuoc sach)) y nang x ho. hieu van pham thuc va thanh ((do ve) OR (de ve)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) y nang x ho. hieu van pham thuc va thanh ((do ve) OR (de ve)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) y nang x ho. hieu van pham thuc va thanh ((do ve) OR (de ve)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) y nang x ho. hieu van pham thuc va thanh ((do ve) OR (de ve)) triet*.