Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
qua cam » qua cham, qua cac, qua ca
cam tuc » cam xuc, cam tu, nam thuc
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach 2, sach vay
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: te ((sach v) or (sach y)) nang xa hoi. hieu qua cam tuc ((va hanh) OR (va thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach y)) nang xa hoi. hieu qua cam tuc ((va hanh) OR (va thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach y)) nang xa hoi. hieu qua cam tuc ((va hanh) OR (va thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang xa hoi. hieu qua cam tuc ((va hanh) OR (va thanh)) vi cua tre*.