Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
tang hanh » tang thanh, dang hanh, nang hanh
tan hanh » tan thanh, toan hanh, tran hanh
sach ty » sach y, sach tu, sach thu
vai cay » va cay, vai cac, vai gay
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
sach uu » sach luu, sach tu, sach xu
ang xa » lang xa, mang xa, dang xay
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: te ((sach ty) or (sach uu)) ang xa hoi. hieu ve cam duc ((tan hanh) OR (tang hanh)) vai cay thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach uu)) ang xa hoi. hieu ve cam duc ((tan hanh) OR (tang hanh)) vai cay thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach uu)) ang xa hoi. hieu ve cam duc ((tan hanh) OR (tang hanh)) vai cay thuoc".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach uu)) ang xa hoi. hieu ve cam duc ((tan hanh) OR (tang hanh)) vai cay thuoc*.