Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
tu truc » tu thuoc, tu trung
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma

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 ty) OR (sach y)) nang xa hoi. hieu va ((tu truc) or (cau truc)) van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) nang xa hoi. hieu va ((tu truc) OR (cau truc)) van hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach y)) nang xa hoi. hieu va ((tu truc) or (cau truc)) van hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach y)) nang xa hoi. hieu va ((tu truc) or (cau truc)) van hanh vai cua tre*.