Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
danh duy » manh duy, danh du, dinh duy
duy cua » day cua, dung cua
duoc va » nuoc va, duc va, duoc ma
tuoc va » thuoc va, nuoc va, tuc va
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
xac ky » cac ky, sac ky, bac ky
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky ((nang xa) or (nang ma)) hoi. hieu vien bach ((tuoc va) or (duoc va)) danh duy cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky ((nang xa) OR (nang ma)) hoi. hieu vien bach ((tuoc va) OR (duoc va)) danh duy cua tre.
• Adding a wildcard symbol may retrieve word variants: su xac ky ((nang xa) or (nang ma)) hoi. hieu vien bach ((tuoc va) or (duoc va)) danh duy cua tre*.