Perhaps you should try some spelling variations:
tang mai » tang ma, tang tai, lang mai
cac kho » cac khoi, cac khoa, cac ho
sao ban » tao ban, cao bang, tao bang
va cham » va chat, va tham
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
cac khu » cac thu, cac khoi, cac kieu
cua tre » cua te, cuu tre, cua triet
so ban » so bang, co ban, lo ban
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((cac kho) OR (cac khu)) tang mai hoi. hieu va cham ((so ban) or (sao ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cac kho) OR (cac khu)) tang mai hoi. hieu va cham ((so ban) OR (sao ban)) hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((cac kho) OR (cac khu)) tang mai hoi. hieu va cham ((so ban) or (sao ban)) hanh vi cua tre*".