Perhaps you should try some spelling variations:
hai chau » lai chau, ha chau, hat chau
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
hai cau » hai chu, hai hau, hoi cau
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
ma hoi » mai hoi, xa hoi, ma hoa
va nam » van nam, ha nam, va nay

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