Perhaps you should try some spelling variations:
trinh tai » trinh toan, trinh tu, trinh han
trong van » trong cac
va trinh » van trinh, va tinh, lap trinh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
qua cam » qua cham, qua cac, qua ca
cam duc » cam xuc, cao duc, pham duc
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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 ty ((trong van) or (lang xa)) hoi. hieu qua cam duc va trinh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((trong van) OR (lang xa)) hoi. hieu qua cam duc va trinh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((trong van) or (lang xa)) hoi. hieu qua cam duc va trinh tai cua tre*.