Perhaps you should try some spelling variations:
chiet tach » chieu sach
thanh tung » thanh cong
hien tach » thien hach, vien bach, hien hanh
tung pham » hung pham, nhung pham, trung phan
nang cong » nang song, dang cong, bang cong
hang cong » dang cong, hang nong, bang cong
ban tai » van tai, han tai, ban thi
tai cao » thai cao, tao cao, tai sao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien tach) OR (chiet tach)) - thanh tung pham ((nang cong) or (hang cong)) ban tai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien tach) OR (chiet tach)) - thanh tung pham ((nang cong) OR (hang cong)) ban tai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien tach) OR (chiet tach)) - thanh tung pham ((nang cong) or (hang cong)) ban tai cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tach) OR (chiet tach)) - thanh tung pham ((nang cong) or (hang cong)) ban tai cao*.