Perhaps you should try some spelling variations:
thien van » thi van
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
nam tu » nam thu, nam thuc
vit ca » viet ca, viet cau
x hoi » xa hoi, o hoi, x ho
vi ca » li ca, va ca, vi ha

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)) ky nang x hoi. thien van nam tu va hanh ((vi ca) OR (vit ca)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. thien van nam tu va hanh ((vi ca) OR (vit ca)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x hoi. thien van nam tu va hanh ((vi ca) OR (vit ca)) tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang x hoi. thien van nam tu va hanh ((vi ca) OR (vit ca)) tren*.