Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
cuc tre » duc tre, cua tre, cuu tre
ve cam » ve cham, ve cac, va cam

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 hoach)) ky nang xa hoi. hieu ve cam tuc ((va danh) OR (va dinh)) tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang xa hoi. hieu ve cam tuc ((va danh) OR (va dinh)) tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) ky nang xa hoi. hieu ve cam tuc ((va danh) OR (va dinh)) tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky nang xa hoi. hieu ve cam tuc ((va danh) OR (va dinh)) tai cuc tre*.