Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
dai hau » dai han, dai hai, dai huu
hai hau » hai chau, hai hai, lai chau
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, tu cach
ly nang » ky nang, ly hang, ly vang
te sach » toc sach
nam luc » nang luc, nhan luc, nam thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ly nang x ho. hieu van nam luc van hanh ((hai hau) OR (dai hau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ly nang x ho. hieu van nam luc van hanh ((hai hau) OR (dai hau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ly nang x ho. hieu van nam luc van hanh ((hai hau) OR (dai hau)) treo".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ly nang x ho. hieu van nam luc van hanh ((hai hau) OR (dai hau)) treo*.