Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hanh tai » thanh tai, hang tai, han tai
cua tre » cua te, cuu tre, cua triet
thai ky » thoi ky, than ky, thai ly
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
hai ky » hoi ky, hai ly, sai ky
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((hai ky) OR (thai ky)) dang xa hoi. hieu ve cam duc van ((nhanh thai) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((hai ky) OR (thai ky)) dang xa hoi. hieu ve cam duc van ((nhanh thai) OR (hanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((hai ky) OR (thai ky)) dang xa hoi. hieu ve cam duc van ((nhanh thai) or (hanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((hai ky) OR (thai ky)) dang xa hoi. hieu ve cam duc van ((nhanh thai) or (hanh tai)) cua tre*.