Perhaps you should try some spelling variations:
vinh cuu » dinh cuu, sinh cua, tinh cua
van hanh » van thanh, ban hanh, van anh
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
dinh cu » dinh cuu, dinh chuc, dinh chau
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, dam thuc
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 y nang ma hoi. hieu va ((cam tuc) or (nam thuc)) van hanh ((vinh cuu) OR (dinh cu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu va ((cam tuc) OR (nam thuc)) van hanh ((vinh cuu) OR (dinh cu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu va ((cam tuc) or (nam thuc)) van hanh ((vinh cuu) OR (dinh cu)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu va ((cam tuc) or (nam thuc)) van hanh ((vinh cuu) OR (dinh cu)) tre*.