Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
thuc cao » thuoc cao, thuc co, thuc can
thuc cay » thuc day, thuc can, thuc xay
su sach » so sach, vu sach
va cham » va chat, va tham
mai hoi » mai khoi, dai hoi, lai hoi
va nang » van nang, da nang, cam nang
v nang » vu nang, van nang, voi nang
cua su » qua su

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 ((v nang) or (va nang)) mai hoi. lieu va cham ((thuc cay) or (thuc cao)) vanh dai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (va nang)) mai hoi. lieu va cham ((thuc cay) OR (thuc cao)) vanh dai cua su.
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (va nang)) mai hoi. lieu va cham ((thuc cay) or (thuc cao)) vanh dai cua su*.