Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
nhung cong » dung cong, thong cong, nhung don
hoc thieu » toc thieu, hoc hien
trinh van » trinh han, trinh quan, trinh toan
hang cong » dang cong, hang nong, bang cong
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
tinh va » tich va, trinh vat, tinh gia

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 - nhanh ((tinh va) or (trinh van)) ((nhung cong) OR (hang cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - nhanh ((tinh va) OR (trinh van)) ((nhung cong) OR (hang cong)) dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - nhanh ((tinh va) or (trinh van)) ((nhung cong) OR (hang cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - nhanh ((tinh va) or (trinh van)) ((nhung cong) OR (hang cong)) dan toan cao*.