Perhaps you should try some spelling variations:
thieu tach » thien hach, chiet tach, chieu sach
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
nang cong » dang cong, bang cong, hang cong
tung cao » nung cao, truong cao, trung cap
tan thai » tay thai, ban thai, tan tai
ban thi » dan thi, van thi, can thi

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 tach - thanh tung cao ((nang cong) OR (nang song)) ((tan thai) or (ban thi)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tach - thanh tung cao ((nang cong) OR (nang song)) ((tan thai) OR (ban thi)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tach - thanh tung cao ((nang cong) OR (nang song)) ((tan thai) or (ban thi)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tach - thanh tung cao ((nang cong) OR (nang song)) ((tan thai) or (ban thi)) cao*.