Perhaps you should try some spelling variations:
sach tham » sach nha
pham thuc » phap thuc, pham chuc, nham thuc
cham tuc » nham thuc, tham thuc, cham soc
lang van » dang van, tang van, hoang van
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu

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 ty) or (sach tham)) lang van hoa. hieu va ((cham tuc) or (pham thuc)) va hanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tham)) lang van hoa. hieu va ((cham tuc) OR (pham thuc)) va hanh va cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tham)) lang van hoa. hieu va ((cham tuc) or (pham thuc)) va hanh va cuu tre*.