Perhaps you should try some spelling variations:
thanh trinh » thanh tinh, thanh binh, thanh trung
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh, hanh chinh
phuong van » phung van, phuong lan, phuong va
hoc thieu » toc thieu, hoc hien
phong van » phung van, thong van, phong va
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: hoc thieu xanh - ((hanh trinh) or (thanh trinh)) va nhung ((phuong van) OR (phong van)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((hanh trinh) OR (thanh trinh)) va nhung ((phuong van) OR (phong van)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((hanh trinh) or (thanh trinh)) va nhung ((phuong van) OR (phong van)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((hanh trinh) or (thanh trinh)) va nhung ((phuong van) OR (phong van)) toan tap*.