Perhaps you should try some spelling variations:
hoc thien » hoc hien, hoc thiet, hoc tien
hoc thieu » toc thieu, hoc hien
trong dai » trong doi, trong dam, trong hai
dang cong » dung cong
tac nhanh » tac nhan, tac thanh, tai nhanh
nhanh cau » nhanh cay, thanh chau, nhanh ha
cong tac » cong ty

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thien) OR (hoc thieu)) dang - hanh ((trong dai) or (truong dai)) dang cong tac nhanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thien) OR (hoc thieu)) dang - hanh ((trong dai) OR (truong dai)) dang cong tac nhanh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thien) OR (hoc thieu)) dang - hanh ((trong dai) or (truong dai)) dang cong tac nhanh cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thien) OR (hoc thieu)) dang - hanh ((trong dai) or (truong dai)) dang cong tac nhanh cau*.