Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh doi » thanh doi, hanh noi, hang doi
sach ky » sac ky, sach y, sach ty
doi cua » dai cua, hoi cua
tuc van » thuc van, truc van, duc van
hieu va » lieu va, hieu qua
hieu ve » hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky tang xa hoi. ((hieu ve) or (hieu va)) cham ((tuc van) OR (tuc va)) hanh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky tang xa hoi. ((hieu ve) OR (hieu va)) cham ((tuc van) OR (tuc va)) hanh doi cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky tang xa hoi. ((hieu ve) or (hieu va)) cham ((tuc van) OR (tuc va)) hanh doi cua tu*".