Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thu sach » thuat sach, thuoc sach, thu hoach
hanh cat » hanh cac, hanh luat, nhanh cay
hanh ca » hanh cac, hanh cua, hanh cad
cac tuc » cac toc, cac tu, cac tac
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
qua cac » cua cac
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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)) ty nang ma hoi. hieu qua cac tuc va ((hanh ca) or (hanh cat)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang ma hoi. hieu qua cac tuc va ((hanh ca) OR (hanh cat)) cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang ma hoi. hieu qua cac tuc va ((hanh ca) or (hanh cat)) cau tren*".