Perhaps you should try some spelling variations:
thanh trung » thanh tung
thong tuong » thong thuong, thong thong, thong duong
theo chieu » theo tieu, ho chieu, theo chu
mot chieu » doi chieu, ho chieu
tuong dan » huong dan, tung dan, xuong dan
trung va » truong va, trang va, trung ha
va thong » va thuong, va phuong, he thong
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (mot chieu)) tinh - thanh trung va thong tuong dan ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (mot chieu)) tinh - thanh trung va thong tuong dan ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (mot chieu)) tinh - thanh trung va thong tuong dan ((toan cao) or (toan tap))*.