Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
va thanh » gia thanh, ban thanh, va tinh
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va danh, ban hanh
ky tang » ky nang, ky dang, kho tang
hoc hoi » hoc khoi, hoc hoa, hoc noi
thai va » thai van
hoa doi » hoa dai, hoc doi, xoa doi
hieu ve » hieu va, hieu van
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky tang ((hoc hoi) or (hoa doi)). hieu ve nam thuc ((va hanh) or (va thanh)) thai va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky tang ((hoc hoi) OR (hoa doi)). hieu ve nam thuc ((va hanh) OR (va thanh)) thai va trien.
• Adding a wildcard symbol may retrieve word variants: te sac ky tang ((hoc hoi) or (hoa doi)). hieu ve nam thuc ((va hanh) or (va thanh)) thai va trien*.