Perhaps you should try some spelling variations:
thien van » thi van
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, lieu va, hieu ve
duc van » duc va, duc tan, duc manh
hac duc » hoc duc, ha duc, thach duc
sach ky » sac ky, sach ty, sach kem
nang o » nang co, nang ho, nang ro
cua tu » cua tuc, cua su, cua cu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) nang o hoi. ((hieu van) OR (thien van)) hac duc van hanh thai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang o hoi. ((hieu van) OR (thien van)) hac duc van hanh thai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang o hoi. ((hieu van) OR (thien van)) hac duc van hanh thai cua tu*".