Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
vat dung » van dung, viet dung, mat duong
san thai » ban thai, van thai, sinh thai
sac thai » rac thai, sach tham, toc thai
va dung » van dung, va duong, va ung

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