Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
nang xa » lang xa, nang ma, mang xa
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuoc sach)) thu ((nang xa) or (nang x)) hoi. hieu van cam tuc va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) thu ((nang xa) OR (nang x)) hoi. hieu van cam tuc va hanh vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) thu ((nang xa) or (nang x)) hoi. hieu van cam tuc va hanh vi su triet*".