Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
sach ty » sach y, sach tu, sach thu
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang ma hoi. hieu va pham thuc ((va danh) OR (va hanh)) tu ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ma hoi. hieu va pham thuc ((va danh) OR (va hanh)) tu ((cua te) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang ma hoi. hieu va pham thuc ((va danh) OR (va hanh)) tu ((cua te) or (cua tu))*".