Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
cham luc » cham soc, nhan luc, cham cuu
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
tang ha » lang ha, tang ma, trung ha
va hanh » van hanh, va thanh, va danh
hieu va » hieu qua
luc va » duc va, tuc va, loc va
bao ky » cao ky, ban ky, bo ky
ha hoi » hoa hoi, ha noi, xa hoi
bac ky » cac ky, ban ky, sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((bao ky) or (bac ky)) tang ha hoi. ((hieu va) OR (lieu va)) cham luc va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((bao ky) OR (bac ky)) tang ha hoi. ((hieu va) OR (lieu va)) cham luc va hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((bao ky) or (bac ky)) tang ha hoi. ((hieu va) OR (lieu va)) cham luc va hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((bao ky) or (bac ky)) tang ha hoi. ((hieu va) OR (lieu va)) cham luc va hanh tai cua tre*.