Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thu sach » thuat sach, thuoc sach, thu hoach
nang cau » nang cao, hang cau, nang dau
hanh ki » hanh ky, hanh kien, thanh kim
xuc van » duc van, luc van, vuc van
tu sach » su sach, te sach, tu cach
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

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 (thu sach)) vu nang cau hoi. hieu va cam xuc van ((hanh ki) or (hanh vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) vu nang cau hoi. hieu va cam xuc van ((hanh ki) OR (hanh vi)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) vu nang cau hoi. hieu va cam xuc van ((hanh ki) or (hanh vi)) su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) vu nang cau hoi. hieu va cam xuc van ((hanh ki) or (hanh vi)) su triet*.