Perhaps you should try some spelling variations:
thieu tach » thien hach, chiet tach, chieu sach
hoc thieu » toc thieu, hoc hien
nang cong » nang song, dang cong, bang cong
tung cao » truong cao, trung cap, quang cao
nung cao » nang cao, nhung cau, quang cao
cong tan » cong tac, cong san, cong thanh
thai cao » thoai cac, thuat cao, toan cao
tai cao » tao cao, tai sao, tai cac

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