Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
cam luc » cam xuc
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ky lang) or (ky tang)) xa hoi. hieu va ((cam luc) OR (cau luc)) va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky tang)) xa hoi. hieu va ((cam luc) OR (cau luc)) va hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) or (ky tang)) xa hoi. hieu va ((cam luc) OR (cau luc)) va hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) or (ky tang)) xa hoi. hieu va ((cam luc) OR (cau luc)) va hanh tai cua tre*.