Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
va triet » va thiet, ve triet, cua triet
tinh vai » tinh va, tinh hai, tinh bai
te sach » toc sach
thuc va » thuc dan, thuc day
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
va lam » van lam, va lap
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: te sach y nang ma hoi. hieu va lam ((thuc va) OR (thuc vat)) tinh vai ((va triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu va lam ((thuc va) OR (thuc vat)) tinh vai ((va triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu va lam ((thuc va) OR (thuc vat)) tinh vai ((va triet) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu va lam ((thuc va) OR (thuc vat)) tinh vai ((va triet) or (va trien))*.