Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
van nhanh » van thanh, van hanh, van khanh
thai cua » than cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
trai ky » thai ky
tang xa » trang xa, tang ma, lang xa
hieu va » hieu qua
duc van » duc va, duc tan, duc manh
tai ky » thai ky, sai ky, dai ky

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

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