Perhaps you should try some spelling variations:
sach tham » sach nha
sach thue » sach thu, sach thieu, cach thuc
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va danh, ban hanh
van cam » van nam, van lam, van cau
cam tu » cam thu, nam tu, dam tu
ki su » ky su

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

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