Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
chau viet » chu viet, khau viet, cham viet
van hanh » van thanh, ban hanh, van anh
chat luc » chat xuc, chat lua, nhan luc
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu van
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, duc van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat san) or (su sach)) ty nang x ho. ((hieu ve) OR (hieu va)) chat luc van hanh lai chau viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat san) OR (su sach)) ty nang x ho. ((hieu ve) OR (hieu va)) chat luc van hanh lai chau viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat san) or (su sach)) ty nang x ho. ((hieu ve) OR (hieu va)) chat luc van hanh lai chau viet".
• Adding a wildcard symbol may retrieve word variants: ((thuat san) or (su sach)) ty nang x ho. ((hieu ve) OR (hieu va)) chat luc van hanh lai chau viet*.