Perhaps you should try some spelling variations:
trang tuan » tran tuan, trung tuan, trong tuan
hieu manh » chieu xanh, hieu nganh, dieu hanh
trang qua » trong qua, trong quan, trung quan
trong san » trong cac, cong san, dong san
hoc hieu » hoc thieu, hoc hien, doc hieu
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - hanh ((trang qua) or (trang tuan)) dung trong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh ((trang qua) OR (trang tuan)) dung trong san toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh ((trang qua) or (trang tuan)) dung trong san toan cau*.