Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
chat tre » chat tai, cho tre, choi tre
hanh lam » thanh lap, hanh kem, hanh va
tay tang » tay lang, tay trung, tay quang
tham duc » pham duc, tham du, than duc
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
ty tang » ty xang, ty hang, ky tang
hieu va » lieu va, hieu qua
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: su sach ((ty tang) or (tay tang)) ma hoi. hieu va tham duc va hanh lam ((chat tre) OR (chay tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty tang) OR (tay tang)) ma hoi. hieu va tham duc va hanh lam ((chat tre) OR (chay tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty tang) or (tay tang)) ma hoi. hieu va tham duc va hanh lam ((chat tre) OR (chay tren))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty tang) or (tay tang)) ma hoi. hieu va tham duc va hanh lam ((chat tre) OR (chay tren))*.