Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
cau theo » cau thi, cau tao
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
xang ma » tang ma, nang ma, sang ma
tuc va » thuc va, truc va, tuc xa
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: toc sach ty xang ma hoi. hieu va cac ((tuc va) or (loc va)) hanh trinh ((cau tren) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty xang ma hoi. hieu va cac ((tuc va) OR (loc va)) hanh trinh ((cau tren) OR (cau theo)).
• Adding a wildcard symbol may retrieve word variants: toc sach ty xang ma hoi. hieu va cac ((tuc va) or (loc va)) hanh trinh ((cau tren) or (cau theo))*.