Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thien van » thi van
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cau tuc » cau truc, cau tu, cau luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (tu sach)) ky nang xa hoi. ((thien van) or (lieu va)) cau tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (tu sach)) ky nang xa hoi. ((thien van) OR (lieu va)) cau tuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (tu sach)) ky nang xa hoi. ((thien van) or (lieu va)) cau tuc va hanh vi cua tre*.