Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
tri cuu » tri cua, tra cuu, trinh cuu
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
tuc va » thuc va, truc va, duc va
va cam » va cham, va cac, va cao
loc va » hoc va, luc va
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: te sach ky nang ma hoi. hieu va cam ((((tuc va) OR (tuc xa))) or (loc va)) hanh tri cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu va cam ((((tuc va) OR (tuc xa))) OR (loc va)) hanh tri cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu va cam ((((tuc va) OR (tuc xa))) or (loc va)) hanh tri cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu va cam ((((tuc va) OR (tuc xa))) or (loc va)) hanh tri cuu tre*.