Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
sach ho » sach hoi, sach ha, sach lo
cua tre » cua te, cuu tre, cua triet
hanh di » hanh vi, hanh de, hang di
vu sach » vu bach, su sach, vu khach
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
ho nang » thi nang, kha nang, cao nang

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 ho nang xa hoi. hieu van cam ((duc va) or (thuc vat)) hanh di ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ho nang xa hoi. hieu van cam ((duc va) OR (thuc vat)) hanh di ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: vu sach ho nang xa hoi. hieu van cam ((duc va) or (thuc vat)) hanh di ((cua tre) or (su triet))*.