Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
lang cong » dang cong, bang cong, hang cong
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
toan cao » toan ban, toan tap
va lang » va nang, hoa lang

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) or (thanh cong)) va lang cong vang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - ((thanh tung) OR (thanh cong)) va lang cong vang toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - ((thanh tung) or (thanh cong)) va lang cong vang toan cao*.