Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu tinh » trieu tinh, chieu tinh, thien tinh
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
nang nong » nang song, hang nong, nang cong
nang dong » nang song, lang dong, nang luong
san than » sang than, san thanh, ban than
than cao » toan cao, thai cao, than cap

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 tinh - ((hanh trinh) or (thanh trung)) va ((nang nong) OR (nang dong)) san than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - ((hanh trinh) OR (thanh trung)) va ((nang nong) OR (nang dong)) san than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - ((hanh trinh) or (thanh trung)) va ((nang nong) OR (nang dong)) san than cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - ((hanh trinh) or (thanh trung)) va ((nang nong) OR (nang dong)) san than cao*.