Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thien van » thi van
nam luoc » nam duoc, nam buoc, nam quoc
luoc van » luoc can, luoc va, luc van
cua viet » hoa viet, cua vat, cua dieu
thanh vi » hanh vi, thanh va, thanh ve
ca viet » va viet, co viet, hoa viet
cao hoc » co hoc, cho hoc, chat hoc
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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 ((cau hoi) or (cao hoc)). thien van nam luoc van thanh vi ((cua viet) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang ((cau hoi) OR (cao hoc)). thien van nam luoc van thanh vi ((cua viet) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: te sac ky nang ((cau hoi) or (cao hoc)). thien van nam luoc van thanh vi ((cua viet) or (ca viet))*.