Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, sach tham
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, xach tay
van dat » van dao, van dau, dan dat
va tinh » may tinh
vai cua » dai cua, hai cua, lai cua
cua chu » sua chua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ty) OR (sach thu)) lang xa hoi. hieu van dat (nuoc or duoc) va tinh vai cua chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ty) OR (sach thu)) lang xa hoi. hieu van dat (nuoc OR duoc) va tinh vai cua chu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ty) OR (sach thu)) lang xa hoi. hieu van dat (nuoc or duoc) va tinh vai cua chu".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ty) OR (sach thu)) lang xa hoi. hieu van dat (nuoc or duoc) va tinh vai cua chu*.