Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
dan hanh » dang hanh, dan khanh, dan thanh
cuu hoc » cua hoc, cuu thuoc, cuu khoa
hanh te » hanh tu, hanh ve, hanh de
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
te cua » tue cua, le cua, de cua
cua te » cua tu
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((x hoi) OR (xa hoi)). ((hieu van) or (thien van)) cuu hoc dan hanh te cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((x hoi) OR (xa hoi)). ((hieu van) OR (thien van)) cuu hoc dan hanh te cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((x hoi) OR (xa hoi)). ((hieu van) or (thien van)) cuu hoc dan hanh te cua te".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((x hoi) OR (xa hoi)). ((hieu van) or (thien van)) cuu hoc dan hanh te cua te*.