Perhaps you should try some spelling variations:
kem phat » te phat, de phat, tam phat
nam duoc » nam thuoc, da duoc, dat duoc
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
lam duc » lam duoc, pham duc, lam dung
va hanh » van hanh, va thanh, va danh
sach 2 » sach y
ma hoi » mai hoi, xa hoi, ma hoa
sach v » sach va, sach y, sach vay

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 v) OR (sach 2)) nang ma hoi. hieu van ((lam duc) or (nam duoc)) va hanh kem phat trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach 2)) nang ma hoi. hieu van ((lam duc) OR (nam duoc)) va hanh kem phat trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) OR (sach 2)) nang ma hoi. hieu van ((lam duc) or (nam duoc)) va hanh kem phat trien".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) OR (sach 2)) nang ma hoi. hieu van ((lam duc) or (nam duoc)) va hanh kem phat trien*.