Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
hai cau » hai chau, hai chu, hai hau
va hanh » van hanh, va thanh, va danh
va lanh » va lang, va danh, va anh
su sach » so sach, vu sach
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma
nam tuc » nam thuc, nam truc, nam tu

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 ky nang xa hoi. ((hieu va) OR (lieu va)) nam tuc ((va lanh) or (va hanh)) hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu va) OR (lieu va)) nam tuc ((va lanh) OR (va hanh)) hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu va) OR (lieu va)) nam tuc ((va lanh) or (va hanh)) hai cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu va) OR (lieu va)) nam tuc ((va lanh) or (va hanh)) hai cau treo*.