Perhaps you should try some spelling variations:
trong nang » trong ngang, thong nang, trong dang
trong nong » trong cong
doi chieu » doc hieu, doi chi, mot chieu
nang hang » nang sang, hang hang, cang thang
ho chieu » theo chieu, hoc thieu, mot chieu
phat cau » phan cau, pha cau, phap cau
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chieu)) sach - nang hang va dung ((trong nang) OR (trong nong)) phat cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - nang hang va dung ((trong nang) OR (trong nong)) phat cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) sach - nang hang va dung ((trong nang) OR (trong nong)) phat cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sach - nang hang va dung ((trong nang) OR (trong nong)) phat cau*.