Perhaps you should try some spelling variations:
chat trung » chat trong, ha trung, cua trung
thu sach » thuat sach, thuoc sach, thu hoach
hieu cac » hieu luc, hieu va, hieu van
vanh dai » van dai, vanh tai, lanh dao
trung va » truong va, trang va, trung ha
cac chat » cao chat, cac thuat, cac nha
cau treo » cau theo, cau tren, cau triet
nang xa » nang x, lang xa, nang ma
tu sach » su sach, te sach, tu cach
va vanh » va van, va danh, va hanh
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: ((thu sach) OR (tu sach)) ky nang xa hoi. hieu cac chat trung va vanh dai ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang xa hoi. hieu cac chat trung va vanh dai ((cua tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang xa hoi. hieu cac chat trung va vanh dai ((cua tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky nang xa hoi. hieu cac chat trung va vanh dai ((cua tre) or (cau treo))*.