Perhaps you should try some spelling variations:
thieu manh » hieu manh, tien manh, trieu minh
quan thanh » ban thanh, van thanh
hoc thieu » toc thieu, hoc hien
tran tuan » tran xuan, tran quang, tran thanh
dung cong » dung trong
cong rac » cong tac, cong cac, cong dac
rac tren » ran tren, tac tren, sach tren
tren cay » trien cay, tren may, ten cay

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu manh - thanh ((tran tuan) or (quan thanh)) dung cong rac tren cay~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu manh - thanh ((tran tuan) OR (quan thanh)) dung cong rac tren cay.
• Adding a wildcard symbol may retrieve word variants: hoc thieu manh - thanh ((tran tuan) or (quan thanh)) dung cong rac tren cay*.