Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, tang ha
lang xa » lang ha, dang xay, lang van
sai kho » dai kho, tai khoa, dai khoa
dua ban » dia ban, cua ban, qua ban
su sai » su tai, su hai, su dai
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai

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

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