Perhaps you should try some spelling variations:
thien van » thi van
nang dau » hang dau, xang dau, nang du
dau hoi » cau hoi, dai hoi, dan hoi
hieu va » hieu qua
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va
vi luu » vi lua

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 nang dau hoi. ((((hieu va) or (thien van))) or (lieu va)) cam xuc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang dau hoi. ((((hieu va) OR (thien van))) OR (lieu va)) cam xuc va hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang dau hoi. ((((hieu va) or (thien van))) or (lieu va)) cam xuc va hanh vi luu tre*.