Perhaps you should try some spelling variations:
hieu tieng » viet tieng, dien tieng, tiep tieng
hieu hien » bieu hien, dieu hien, chieu chien
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
cac tu » cac thu, cach tu, cac du
tu van » tu va
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu nang xa hoi. ((hieu tieng) or (hieu hien)) cac tu van thanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang xa hoi. ((hieu tieng) OR (hieu hien)) cac tu van thanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang xa hoi. ((hieu tieng) or (hieu hien)) cac tu van thanh vi cuu tre*.