Perhaps you should try some spelling variations:
phan lap » phan dau
toc sac » toc sach, toc san, hoc sach
lap cua » lai cua, tap cua, lam cua
va phan » van phan, va phat, va phap
hieu va » lieu va, hieu qua
hieu ve » hieu van
tao hoi » tao khoi, tao boi, thao hoc
tay hoi » tay ho, tay thai
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky sang ((tao hoi) OR (tay hoi)). ((hieu ve) OR (hieu va)) pham duc va phan lap cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky sang ((tao hoi) OR (tay hoi)). ((hieu ve) OR (hieu va)) pham duc va phan lap cua te".
• Adding a wildcard symbol may retrieve word variants: toc sac ky sang ((tao hoi) OR (tay hoi)). ((hieu ve) OR (hieu va)) pham duc va phan lap cua te*.