Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
doi chieu » doc hieu, doi chi, ho chieu
lang cong » dang cong, bang cong, hang cong
cong dan » cong san, cong tan, huong dan
dan giai » dan gian, luan giai, va giai
giai cao » giai ca, giai cac, giai bai
manh va » hanh va, anh va, lanh va
minh va » tinh va, sinh va, sinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (doi chieu)) sach - lanh ((manh va) or (minh va)) lang cong dan giai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doi chieu)) sach - lanh ((manh va) OR (minh va)) lang cong dan giai cao.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doi chieu)) sach - lanh ((manh va) or (minh va)) lang cong dan giai cao*.