Perhaps you should try some spelling variations:
nhung tung » nhung tuong, nhung dung, nhung vung
hieu tinh » chieu tinh, lieu tinh, kieu tinh
doc hieu » toc thieu, hoc thieu, hoc hien
trung va » truong va, trung ha, trung tam
trang va » tran van, hang va
tung dan » dung dan, huong dan, trung dai
dan thai » dang thai, dan thi, dan than
thai cao » tai cao, thoai cac, thuat cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tinh - thanh ((trung va) or (trang va)) nhung tung dan thai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - thanh ((trung va) OR (trang va)) nhung tung dan thai cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - thanh ((trung va) or (trang va)) nhung tung dan thai cao*.