Perhaps you should try some spelling variations:
sach ty » sach y, sach tu, sach thu
hai chu » hai chau, hoi chu, hai chi
hai cau » hai chau, hai hau, hoi cau
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
va lam » van lam, va lap
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ma hoi. hieu va lam ((tuc va) or (tuc xa)) danh ((hai cau) OR (hai chu)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. hieu va lam ((tuc va) OR (tuc xa)) danh ((hai cau) OR (hai chu)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoi. hieu va lam ((tuc va) or (tuc xa)) danh ((hai cau) OR (hai chu)) treo".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu va lam ((tuc va) or (tuc xa)) danh ((hai cau) OR (hai chu)) treo*.