Perhaps you should try some spelling variations:
nhan tai » hang tai, van tai, toan tai
thu sac » thu sach, thu san, thu xac
cam suc » cam xuc, cao suc, cham soc
han tai » hang tai, van tai, toan tai
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sac ky » cac ky, 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: thu sac ky ((nang xa) or (lang xa)) hoi. hieu ve cam suc manh ((han tai) or (nhan tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang xa) OR (lang xa)) hoi. hieu ve cam suc manh ((han tai) OR (nhan tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang xa) or (lang xa)) hoi. hieu ve cam suc manh ((han tai) or (nhan tai)) cua tre*.