Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
hanh tang » hanh trang, hanh mang, hanh tung
dung cong » dung trong
anh tang » anh bang, anh dang, anh nang
gian nan » gian dan, gian lan, gian van

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 tang) OR (anh tang)) cua ((thong cong) or (dung cong)) dan gian nan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((hanh tang) OR (anh tang)) cua ((thong cong) OR (dung cong)) dan gian nan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((hanh tang) OR (anh tang)) cua ((thong cong) or (dung cong)) dan gian nan".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((hanh tang) OR (anh tang)) cua ((thong cong) or (dung cong)) dan gian nan*.