Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
hieu van » hieu va, thien van, lieu va
toc gia » toc giay, tac gia, quoc gia
lam toc » lam thuoc, lam truoc, lam duoc
van lam » van nam
vu sach » vu bach, su sach, vu khach
cua tec » cua tuc, cua toc, cua viec
sach ky » sac ky, sach y, sach ty
so hoc » co hoc, mo hoc, so hoa
cua te » cua tu
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: vu sach ky nang ((o hoi) or (so hoc)). hieu van lam toc gia thanh hoi ((cua te) or (cua tec))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((o hoi) OR (so hoc)). hieu van lam toc gia thanh hoi ((cua te) OR (cua tec)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((o hoi) or (so hoc)). hieu van lam toc gia thanh hoi ((cua te) or (cua tec))*.