Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
manh hai » lanh hai, minh hai, thanh hai
trung va » truong va, trang va, trung ha
dang xay » dang van, van xay
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
van hoc » van hoa
lang xa » lang ha, lang van
va manh » van manh, va danh, va hanh
hai cua » thai cua, dai cua, hoi cua
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 ky ((lang xa) OR (dang xay)) hoi. hieu ((van cac) or (van hoc)) trung va manh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((lang xa) OR (dang xay)) hoi. hieu ((van cac) OR (van hoc)) trung va manh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((lang xa) OR (dang xay)) hoi. hieu ((van cac) or (van hoc)) trung va manh hai cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((lang xa) OR (dang xay)) hoi. hieu ((van cac) or (van hoc)) trung va manh hai cua te*.