Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hieu cao » chieu cao, hieu ca, kieu cao
hieu cac » hieu luc, hieu va, hieu van
ha trung » he trung, ba trung, va trung
trung va » truong va, trang va, trung ha
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren

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 ky nang xa hoi. ((hieu cao) or (hieu cac)) ha trung va hanh dai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. ((hieu cao) OR (hieu cac)) ha trung va hanh dai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. ((hieu cao) or (hieu cac)) ha trung va hanh dai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu cao) or (hieu cac)) ha trung va hanh dai ((cua tre) OR (cua triet))*.