Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
toc sach » hoc sach, doc sach, thuoc sach
thanh de » hanh de, thanh ve, thanh do
va thanh » gia thanh, ban thanh, va tinh
hieu vu » hieu va, hieu ve, hieu su
nang o » nang co, nang ho, nang ro
de cua » le cua, te cua, dieu cua
cua te » cua tu
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thuat sach)) ky nang o hai. hieu vu ((nhan luc) or (nang luc)) va thanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuat sach)) ky nang o hai. hieu vu ((nhan luc) OR (nang luc)) va thanh de cua te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuat sach)) ky nang o hai. hieu vu ((nhan luc) or (nang luc)) va thanh de cua te*.