Perhaps you should try some spelling variations:
tuong dan » huong dan, tung dan, xuong dan
trong van » trong cac
doc hieu » toc thieu, hoc thieu, hoc hien
tung dap » tung dan, trung dai, tuong dao
van toan » van tuan, van tan, van thanh
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chi) or (doc hieu)) sang - thanh ((tung dap) or (tuong dan)) dung trong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chi) OR (doc hieu)) sang - thanh ((tung dap) OR (tuong dan)) dung trong van toan cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chi) or (doc hieu)) sang - thanh ((tung dap) or (tuong dan)) dung trong van toan cau*.