Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh lap » thanh san, phan lap, thanh hai
dang xay » dang van, van xay
hanh lai » hanh lam, hanh tai, thanh loi
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
nam duc » nam duoc, pham duc, nam thuc
lang xa » lang ha, lang van
cua te » cua tu

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 ((lang xa) or (dang xay)) hoi. hieu van nam duc va ((hanh lai) or (thanh lap)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty ((lang xa) OR (dang xay)) hoi. hieu van nam duc va ((hanh lai) OR (thanh lap)) cua te.
• Adding a wildcard symbol may retrieve word variants: thuat sach ty ((lang xa) or (dang xay)) hoi. hieu van nam duc va ((hanh lai) or (thanh lap)) cua te*.